Low frequency power amplifier
专利汇可以提供Low frequency power amplifier专利检索，专利查询，专利分析的服务。并且A power amplifier for low-frequency oscillations, realizable by integrated-circuit technique, comprises a number of cascaded transistors forming a high-impedance input stage, an intermediate or driver stage and a balanced power stage feeding a central output terminal 12. A control transistor T2 constituting part of a composite input transistor T1, T2 has its collector grounded through a current-limiting transistor T4 paired with an identical transistor T5 producing an image current which duplicates the collector current of the control transistor T2 and passes through a voltage divider composed of a pair of resistors R6, R7 each of the same magnitude as a feedback resistor R8 inserted between the output terminal 12 and the emitter of transistor T2. A controlled transistor T3 at the entrance of the intermediate stage, of the same conductivity type (PNP) as the control transistor T2 and susbtantially identical therewith, has its base connected to the collector of transistor T2 and has its emitter energized through an ancillary transistor T9 of opposite conductivity type whose base is tied to the junction of resistors R6 and R7. The emitters of transistors T9 and T3 are interconnected via a further resistor R9 of the same magnitude; with the bases of twin transistors T4 and T5 jointly connected to a d-c supply terminal 1 through a biasing transistor T10 and a low resistance (e.g. diodes D'', D'''') equaling the overall emitter/base resistance of composite transistor T1, T2, this arrangement stabilizes the means voltage of output terminal 12 at substantially half the voltage of the ungrounded supply terminal 4.，下面是Low frequency power amplifier专利的具体信息内容。
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